(Equus ferus caballus) (Arabian, adult)n Arabian riding horse (or similar breed) weighs between 380 and 450 kg. During races, horses must carry jockeys and their equipment, which in the Kentucky Derby, for example, can weigh up to 54.4 kg.

In other words, 428.376 kilograms is 0.83 times the weight of a Polar Bear, and the weight of a Polar Bear is 1.2 times that amount.

(Ursus maritimus) (adult, male)An adult, male polar bear weighs between 352 and 680 kg. Polar bears are so heavily insulated by their 9.9 cm (3.9 in) layer of blubber that they are often difficult to detect using infrared photography sensors.

In other words, 428.376 kilograms is 0.822 times the weight of a Grizzly Bear, and the weight of a Grizzly Bear is 1.22 times that amount.

(a.k.a. brown bear, a.k.a. silver bear, Ursus arctos horribilis) (Adult, male, coastal area population average)An adult, male grizzly bear from a coastal area (where food is plentiful) can weigh up to 521 kg. In spite of their tremendous size, grizzly bears can run at speeds of up to 55 kph (34 mph).

(Domestic pig, Sus scrofa domesticus, a.k.a. S. domesticus) (adult)Domestic pigs weigh between 50 kg and 450 kg. The titular character "Babe the pig" in the 1995 family film was played by 48 different American Yorkshire piglets due to the length of filming and the rate at which piglets reach adulthood.